By way of comprehensive investigation and study in consideration of the actual operating conditions and reliable equipments of Kailuan Coal Mine a complete set of the automatic protection system for the railroad crossing signal has been developed and thus the requirement of the railroad signal protection can be met.

This paper tries to improve and research on the railway signal relay locking,and especially deals with its technicality and safety.

On the basis of analyzing the present status and characteristics of railway signalling technique development on North American, West European, Japanese and former USBR railways, this paper puts forward the point of view that railway signalling technique development enters into a new era.

The necessity, system form, aim, major technical indexes and performance of the protable microcomputer monitor on railway signalling are expounded.

Studying on the knowledge representaion of railway signalling has been demanded because of the requirement of the railway signalling intelligent control.

In this paper,a review of the progress and achievement on in railway signallingtechnology and constraction in China is made,including the main contributions of CARStherewith.

Manufacturing of dynamic safety relay for interlocking railway signal by computer;

Improve Construction Technique of Railway Signaling,Ensure Operation Quality of Railway Signaling System;

How reduces the lightning damage which affects to therailway signal equipment;

Combining with the current situation of the railroad signal system,it expounds the conditions of the preventive repair of the railway′s signal equipment.